Malicious PDF — malware analysis report

Static analysis result for SHA-256 388f9c17f1fb5043…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 18:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c606af3456e2e5f751889aeccf0b41ea SHA-1: a684dad9bce65973fc8e2a67f8719191132b7012 SHA-256: 388f9c17f1fb50439115cfc61fa48ace2dacd63a69410e7a0a0fd41155f47eb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The PDF structure and embedded content suggest an attempt to disguise malicious links as legitimate resources, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mimpiindah2.com/contents/files/mobobadub.pdf In PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49052383222.pdfIn PDF document text
    • http://badgerhillfarm.uk/5169718673.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210912040503.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109110404032206.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/japuguseloxov.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/gepubilonomuniz.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/99966426160.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zukitujarariz.pdfIn PDF document text
    • http://tion.hu/upload/file/gimumil.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210912_214424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613206a3e9c27---derozijiniletevibojas.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/vusare.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/14664819291.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090910081988.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/52974807980.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/48763559575.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/zirizot.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/kevobevokuxujurudiwazad.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/duwupevigofowonoxul.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/54705351413.pdfIn PDF document text
    • http://palami.by/images/file/lirifaniso.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/wuwedelamazubatubapalaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ac+market+gta+vPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC076 10184 bytes
SHA-256: 6ccf0e13e7b3ac73330a0952cf3c4ac1beba4def7405386f4d7474bf513fe987
font_01_sfnt_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 17396 bytes
SHA-256: 4bf35331637d545a30fe9146821a0a3ff05a84067945f5fb36e91f32f99f7e5e
font_02_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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